class TemperatureConverter:

    KEVIN = 'K'
    FAHRENHEIT = 'F'
    CELSIUS = 'C'

    @staticmethod
    def celsius_to_fahrenheit(c):
        return 9 * c / 5 + 32
    
    @staticmethod
    def format(value, unit):
        symbol = ''
        if unit == TemperatureConverter.CELSIUS:
            symbol = 'F'
        
        return f'{value}{symbol}'
    
print(type(TemperatureConverter.celsius_to_fahrenheit))